Re-add valgrind suppression for bug 16584.

tools/valgrind/memcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 560 matching lines @@
    fun:malloc
    fun:g_malloc
    fun:g_slice_alloc
    fun:g_slice_alloc0
    fun:g_type_create_instance
    fun:*
    fun:g_object_newv
    fun:g_object_new_valist
 }
 {
+   bug_16584
+   Memcheck:Leak
+   fun:_Znwj
+   ...
+   fun:_ZN7WebCore10CSSRuleSet12addToRuleSetEPNS_16AtomicStringImplERN3WTF7HashMapIS2_PNS_15CSSRuleDataListENS3_7PtrHashIS2_EENS3_10HashTraitsIS2_EENS9_IS6_EEEEPNS_12CSSStyleRuleEPNS_11CSSSelectorE
+   fun:_ZN7WebCore10CSSRuleSet7addRuleEPNS_12CSSStyleRuleEPNS_11CSSSelectorE
+   fun:_ZN7WebCore10CSSRuleSet17addRulesFromSheetEPNS_13CSSStyleSheetERKNS_19MediaQueryEvaluatorEPNS_16CSSStyleSelectorE
+   ...
+   fun:_ZN7WebCore16CSSStyleSelectorC1EPNS_8DocumentERKNS_6StringEPNS_14StyleSheetListEPNS_13CSSStyleSheetEbb
+   fun:_ZN7WebCore8Document6attachEv
+   fun:_ZN7WebCore5Frame11setDocumentEN3WTF10PassRefPtrINS_8DocumentEEE
+   fun:_ZN7WebCore11FrameLoader5beginERKNS_4KURLEbPNS_14SecurityOriginE
+   fun:_ZN7WebCore11FrameLoader4initEv
+   fun:_ZN7WebCore5Frame4initEv
+}
+{
    bug_17113
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN18ResourceDispatcher12CreateBridgeERKSsRK4GURLS4_S4_S1_S1_S1_iiN12ResourceType4TypeEjii
    fun:_ZN11webkit_glue20ResourceLoaderBridge6CreateERKSsRK4GURLS5_S5_S2_S2_S2_iiN12ResourceType4TypeEii
    fun:_ZN11webkit_glue16WebURLLoaderImpl7Context5StartERKN6WebKit13WebURLRequestEPNS_20ResourceLoaderBridge16SyncLoadResponseE
    fun:_ZN11webkit_glue16WebURLLoaderImpl18loadAsynchronouslyERKN6WebKit13WebURLRequestEPNS1_18WebURLLoaderClientE
 }
 {
    bug_17291
@@ skipping 479 matching lines @@
    fun:_ZN6WebKit9WebStringC1ERKSbItN4base20string16_char_traitsESaItEE
    fun:_ZNK14WebPreferences5ApplyEP7WebView
    fun:_ZN10RenderView4InitEiPN4base13WaitableEventEiRK19RendererPreferencesPNS0_14RefCountedDataIiEEi
    fun:_ZN10RenderView6CreateEP16RenderThreadBaseiPN4base13WaitableEventEiRK19RendererPreferencesRK14WebPreferencesPNS2_14RefCountedDataIiEEi
    fun:_ZN12RenderThread15OnCreateNewViewEi16ModalDialogEventRK19RendererPreferencesRK14WebPreferencesi
    ...
    fun:_Z12RendererMainRK18MainFunctionParams
    fun:ChromeMain
    fun:main
 }